Chuck for rock-drills.



E. E. MoKINNEY, Jn. GHUGK FOR ROCK DRILLS.

APPLICATION FILED MAY 28, 1907.

Patented May 25, 1909.

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Ma x mairnn srirrns rairnnir op nion ELI E. MCKINNEY, JR, OF FARMINGTON,ILLINOIS.

CHUCK FOR ROCK-DBILLS.

Application filed May 28, 1907.

To all whom it may concern:

Be it known that I, ELI E. MCKINNEY, J r., a citizen of the UnitedStates, residing at F armington, in the county of Fulton, State ofIllinois, have invented certain new and useful Improvements in Chucksfor Rock- Drills; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The invention relates to chucks and more particularly adapted for usewith the class of coal or rock mining drills.

The primary object of the invention is the provision of a chuck soconstructed and arranged that the drill may be readily inserted in thesocket and having its bearing against a solid portion at the interior ofthe drill socket and also to enable the said drill to be properlycentered therein.

Another object of the invention is the provision of a chuck forreceiving a drill whereby the latter will be prevented from accidentaldisplacement and can be readily and easily withdrawn while in aninoperative position.

With these and other objects in view, the invention consists of thenovel features of construction and combination of parts illustrated inthe accompanying drawings and as will be more fully hereinafterdescribed while the novelty of the invention will be included in theclaims appended.

In the drawingsz-Figure 1.. is a longitudinal sectional view of thedrill socket showing the drill about to be withdrawn therefrom. Fig. 2is a similar view of the drill socket with the drill inserted within thesaid socket. Fig. 3 is a sectional view on the line 2-2 of Fig. 2.

Similar reference characters indicate corresponding parts throughout theseveral. views in the drawings.

In the drawings, the numeral 48 designates the end portion of a drillshalt having mounted thereon a drill socket member 49 having alongitudinal recess 50, one of the end walls of said recess being formedwith an inwardly projecting lug 51 at its outer edge and at right anglesthereto. The drill or anger 52 is formed with a rearwardly ex-Specification of Letters Patent.

Patented May 25, 1909.

Serial No. 376,171.

tending shank 53 having an elongated recess 54 cut in one of its sideedges to form a projecting tang 55 at one end of said recess and anabutment shoulder 58 at the opposite end of the latter. The other sideedge of the shank 53 is curved at its rear end as at 56 to facilitateits introduction into the recess 50 and also to aid in the centering ofthe drill or anger, and said recess has a similarly curved. wall 57which cooperates with the curved edge 56 whereby a positive fitting ofthe ex tension in the recess is effected and to maintain the said augeror drill properly centered when in use.

It is obvious that when the drill or auger is in use by the extensionbeing inserted in the socket the rearmost wall of said extension willhave its bearing against the bottom of the socket so as to form a solidbearing for the extreme end of said drill or auger while the same willhave a bearing against the projecting lug 51 by having the shoulder 58contacting therewith.

In Fig. 1 the drill or auger shank 53 is shown partly engaged in therecess 50 such engagement being effected by inserting said auger shankat an angle in said recess and then by turning the same into alinementtherewith the drill or auger will be coupled and properly centered inthe drill socket, as shown in Fig. 2. The lug 51 engages the tang 55 asa stop to prevent accidental displacement of the parts. The auger shank53 is displaced by reverse operation to that described.

From the foregoing description it will be seen that simple and ellicientmeans are provided for accomplishing the objects of the invention, but,while the elements herein shown and described. are well adapted to servethe functions set forth, it is obvious that various minor changes may bemade in the proportions, shape and arrangement of the several partswithout departing from the spirit and scope of the invention as definedin the appended claim.

What is claimed is In a device of the class described, a casting havingan elongated socket therein, an inwardly projectinglug at the mouth ofsaid socket and at right angles to its end walls and in the plane withthe outer edges thereof, the base of said socket being provided adaptedto alternately contact with said lug with a curvature at the corner ofthe same when engaging the recess in the head. 10 joining the end Wallthereof opposite the lug, In testimony whereof, I allix my signature,and a drill having a terminal head correin presence of tWo Witnesses.

spondingly shaped with respect to the socket ELI E. MCKINNEY, J R.

and adapted to snugly fit Within the same, the said head having anelongated recess in one edge thereof to form spaced shoulders Witnesses:

SAM SAMUELsoNv JOHN HoLMs.

